Knowing the exact weichai engine specifications before you order parts saves time, money and wrong shipments. The four most common Weichai engines in export markets – WD615, WP10, WP12 and WD618 – share the same 126 mm bore family but differ in stroke, displacement and power output. Here is the official data in one table, followed by what each difference means when you buy spare parts.
Weichai Engine Specifications Comparison Table
| Model | Cylinders | Bore x Stroke (mm) | Displacement (L) | Power Range | Typical Application |
|---|---|---|---|---|---|
| WD615 | 6 inline | 126 x 130 | 9.726 | 197-420 hp | HOWO trucks, loaders, machinery |
| WP10 | 6 inline | 126 x 130 | 9.726 | 270-375 hp | Trucks, city buses, cranes |
| WP12 | 6 inline | 126 x 155 | 11.596 | 340-460 hp | Heavy trucks, dump trucks, towing |
| WD618 | 6 inline | 126 x 155 | 11.596 | 300-400 hp (marine) | Marine propulsion, generators |
What the WD615 and WP10 Share
The WD615 and the newer WP10 are both 9.726-litre inline six-cylinder engines with a 126 mm bore and 130 mm stroke. Many internal parts – pistons, liners, gaskets and bearings – were carried over between the families, which is why one Weichai WD615 piston kit often fits several engine ratings. The main differences are in the fuel system, electronics and emission level, not in the basic dimensions.
WP12 and WD618: The Long-Stroke Engines
The Weichai WP12 piston kit and WD618 use the same 126 mm bore with a longer 155 mm stroke, giving 11.596 litres of displacement. The longer stroke produces more torque at lower rpm, which suits heavy trucks and continuous-duty marine applications. Note that crankshafts, camshafts and cylinder liners are not interchangeable between the 130 mm stroke and 155 mm stroke families.
Why Bore and Stroke Matter for Parts Buying
- Piston kits must match the stroke, not just the bore – a 126 mm bore piston for WD615 will not work in a WP12.
- Cylinder liners are engine-specific: always quote the engine model and part number when you order a Weichai cylinder liner.
- Overhaul kits are grouped by family: WP10 and WD615 kits are usually separate from WP12 kits.
Which Weichai Engine Needs Which Overhaul Kit
EPID stocks overhaul kits for every family in this table: the Weichai WP10 overhaul kit, the WP12 kit and the WD615 E2 kit. If your engine serial plate is worn or missing, the displacement and power rating in the table above usually identify the correct kit.
Frequently Asked Questions
Is the Weichai WP10 the same engine as the WD615?
They share the 9.726-litre 126 x 130 mm base design, but the WP10 has a modernized fuel and electronic control system. Basic internal parts often interchange, while injection and electronic parts do not.
What is the Weichai WP12 displacement?
The Weichai WP12 displacement is 11.596 litres, from a 126 mm bore and 155 mm stroke, with power ratings around 340-460 hp depending on the version.
Compare the full Weichai parts range and get your quote on WhatsApp – visit the Weichai engine parts page and contact EPID Diesel Engine Parts.
